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This is the video.

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http://www.teacherdiane.com/youtube/fbOVVE2PoLk/when-do-you-use-passive-voice

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1. Relative clauses modify- define, describe, identify, or give more information about nouns.
2. Use noun before the relative pronoun.
3. Use who or that for people, and which or that for things.
4. Do not add comma before this type of clause.
5. Use an identifying relative clause in definitions, use words anyone, people, someone, or something.

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1.use be not able to and can't/cannot for negative statements in the present. Be not able to is more formal than can't.
2. Use can't and will not/ won't be able to for negative statements in the future. Notice that not comes before be in the future form.
3. Use could(not) to describe general ability in the past. Was/ were(not) able to is also possible, especially to talk about a particular ability or talent.
4. Use could have+ the past participle to describe situations in which a person had the ability to do something but did not do it.

FOR EXAMPLE：they are able to maintain good physical quality.

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1.Use the present form of be + the past participle of the main verb.
2.Use the present perfect form of the passive, use has/have + been + the past participle of the main verb for present perfect form of the passive.
3.Use the present progressive form of the passive, use the present form of be + being +the past participle of the main verb.

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1.an action or event that happened at an unspecified time in the past.
2.actions or events that started in the past and continue into the present.
3.Use the present perfect to describe a recent action.