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When there is something that didn't happen as planned we use be+to+have+past participle. However, the example choose to use be going to "last summer I was going to visit my sister, but I went to Italy instead".  When we use be+to+have+past participle and be going to? 

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When there is something that didn't happen as planned we use be+to+have+past participle. However, the example choose to use be going to "last summer I was going to visit my sister, but I went to Italy instead".  When we use be+to+have+past participle and be going to? 

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Can we use "was about to" in the same way as "was going to"?

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There are several patterns of future in the past grammar, what's different between them and how we use it?

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There are several patterns of future in the past grammar, what's different between them and how we use it?

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Difference in 'hypothethical future' and 'future' past?

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Can we use "was about to" in the same way as "was going to"?

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Is there any misunderstanding in my question? 

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Is there any misunderstanding in my question? 

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How can we avoid confusing readers when switching between past continuous, past perfect, and past perfect continuous in a narrative?

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hallo it's me

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different of meanings of would in the past

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the meaning of future in the past? hmm? I don't get it

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how do we know the exact form to use for a certain condition? For instance, the plan that did not actually happen uses 'be going to' etc. 

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how do we know the exact form to use for a certain condition? For instance, the plan that did not actually happen uses 'be going to' etc. 

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At the 2nd 'Tip', there is a sentence: "One day he would be famous"

Why does this sentence state future in the past? can it be a hypothetical past sentence? what is the solid difference between future in the past and hypothetical past?

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At the 2nd 'Tip', why does in the sentence "One day he would be famous" considered as future in the past? can it be a hypothetical past? how to differ future in the past and hypothetical past in this context?

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The book says we use 'was/were going to' to talk about an unfulfilled plan, like in "I was going to visit my sister, but I went to Italy instead." What's the difference between that and using 'would have' for a hypothetical situation? For instance, "I would have gone to the party if I hadn't been sick." How do the meanings of these two forms differ?

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In what situations do we use past perfect continuous instead of past perfect in narratives?

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I still confusing the meanings of would in the past, there are so many may you explain it clearly please?

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I still confusing the meanings of would in the past, there are so many may you explain it clearly please?

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Does all of the "future in the past" form can be used in the same context

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How do we decide the tenses that we are going to use when writing, because sometimes when we wanna write our scene or story, i often get confused with the correct tenses that are appropriate to use