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I watched you die
I heard you cry every night in your sleep
I was so young
You should have known better than to lean on me
You never thought of anyone else
You just showed your pain
And now I cry in the middle of the night
For the same damn thing.

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It must have been Love by Roxette - Flor C

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It must have been Love by Roxette - Flor C

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It must have been love, but it’s over now.

It must have been good, but I lost it somehow.

It must have been love, but it’s over now.

From the moment we touched,

‘til the time had run out. (1:02 - 1:28)

In this fragment of the song, the modal verb “must” is expressing deduction with a high degree of certainty about a fact that was true in the past.

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Roxette - It Must Have Been Love (Official Music Video)

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And so you're back from outer space.

I just walked in to find you here

With that sad look upon your face.

I should've changed that stupid lock,

I should've made you leave your key,

If I had known, for just one second,

You'd be back to bother me.

Should have:

“Should” is the past tense of the word “shall.” When using the words “should have” you are talking about something in the past that you “ought to” or “might have” done.

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The Man Who Sold The World by Nirvana-Leonardo

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The Man Who Sold The World by Nirvana-Leonardo

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"I laughed and shook his hand
And made my way back home
I searched for form and land

For years and years I roamed

I gazed a gazeless stare
At all the millions here

I must have died alone

A long, long time ago"

We use the modal verb MUST HAVE to refer that we feel sure that something was true in the past (100% sure).

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Nirvana - The Man Who Sold The World (MTV Unplugged)

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Diamonds and Rust by Joan Baez- Alejandra

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Diamonds and Rust by Joan Baez- Alejandra

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But we both know what memories can bring
They bring diamonds and rust
Yes we both know what memories can bring
They bring diamonds and rust

The modal verb can is used to express that the action is possible to happen.

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'Cause yesterday's got nothin' for me
Old pictures that I'll always see
Some things could be better
If we'd all just let them be'

We use will to talk about the future, when we believe what will happen

We use could to show that something is possible in the future, but not certain.

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We can't fall any further if We can't feel ordinary love And we can not reach any higher, If we can't deal with ordinary love

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U2 - Ordinary Love (From Mandela OST) Lyric Video

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You're asking me will my love grow I don't know, I don't know You stick around and it may show I don't know, I don't know

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"I can't keep on waiting for you
I know that you're still hesitating
Don't cry for me
'cause I'll find my way
you'll wake up one day
but it'll be too late"

The  modal verb CAN shows the absence of possibility to continue doing the action.

The modal verb WILL shows the person is making  prediction without evidence in this case.

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Don´t Look Back in Anger by Oasis  - Natali

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Don´t Look Back in Anger by Oasis  - Natali

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Slip inside the eye of your mind
Don't you know you might find
A better place to play
You said that you'd never been
But all the things that you've seen
Will slowly fade away

So I start a revolution from my bed
'Cos you said the brains I had went to my head.
Step outside, summertime's in bloom
Stand up beside the fireplace
Take that look from off your face
You ain't ever gonna burn my heart out

And so Sally can wait, she knows it's too late as we're walking on by
Her soul slides away, but don't look back in anger I heard you say

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Will I ever be too far away when you feel alone (No way no)

Will I ever back down my sword to protect our home (No way no)

Will I ever spend a day not telling you you're beautiful (No way no).

The modal verb WILL is used to say whether something is possible or not.

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"I should've Known Better" by The Beatles - Mariana

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"I should've Known Better" by The Beatles - Mariana

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I should have known better with a girl like you. That I would love everything that you do.

Whoa, oh, I never realized what a kiss could be. This could only happen to me. Can't you see, can't you see. (...)

So I should have realized a lot of things before. If this is love you've got to give me more.

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The Beatles - I Should Have Known Better Lyrics

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Easy come, easy go That's just how you live, oh Take, take, take it all But you never give

Should've known you was trouble From the first kiss Had your eyes wide open Why were they open?

Should implies a regret about a past event.

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"And how could, anybody, deny you
I came here with a load and it feels so much lighter now I met you."

"And honey you should know
That I could never go on without you"

"And I came here to talk
I think you should know"

"And anyone who tried to deny you, must be out of their mind"

"Honey you should know that I could never go on without you"

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Coldplay_Green Eyes Live - San Diego 2002

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I know that they say
That somethings are better left unsaid
It wasn't like you only talked to him and you know it
(Don't act like you don't know it)
All of these things people told me
Keep messing with my head
(Messing with my head)
You should've picked honesty
Then you may not have blown it

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Justin Timberlake- Cry Me A River lyrics

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When I was your man by Bruno Mars - Mercedes

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When I was your man by Bruno Mars - Mercedes

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"That I should’ve bought you flowers and held your hand

Should’ve gave you all my hours when I had the chance

Take you to every party, ‘cause all you wanted to do was dance
Now my baby’s dancing, but she's dancing with another man"

Should’ve (should have) implies something that would have been beneficial to do at that moment. It express regret.

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And so you're back from outer space. I just walked in to find you here With that sad look upon your face. I should've changed that stupid lock, I should've made you leave your key, If I had known, for just one second, You'd be back to bother me.

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You will remember -

When this is blown over

And everything's all by the way -

When I grow older
I will be there at your side to remind you how I still love you - I still love you. (1:50)

Will implies prediction of a future event without any specific evidence.