Write the correct form: 1) Listen! Someone (to knock) at the

Write the correct form: 1) Listen! Someone (to knock) at the door. 2) Don39;t go into the classroom! The students (to write) a dictation there. 3) They (to discuss) it since five o39;clock. 4) Where is Petrov ? -He (to work) in the library. -He (to work) long ? -Yes, he (to work) since morning.

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1) Listen! Someone is knocking at the door. (Present Continuous). 2) Dont go into the classroom! The students are writing a dictation there. (Present Continuous). 3) They have been discussing it since five oclock. (Present Perfect Continuous). 4) Where is Petrov ? He is working in the library. (Present Continuous). Has he been working long? (Present Perfect Continuous). Yes, he has been working since morning. (Present Perfect Continuous).
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