Put the verbs into the correct tense form (Past Simple, Past Perfect or Past Continuous).

1. When mother (to come) home, the children (to eat) the soup which she (to cook) in the morning.
2. When I (to ring) up Mike, he still (to learn) the poem which he (to begin) learning at school.
3. When I (to open) the door of the classroom, I (to see) that the teacher (already, to come) and the pupils (to write) a dictation.
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