1) "You (to wake) the children?" -"Not yet, they still (to sleep)"
2) You are late, the lesson (to begin) already
3) The weather is nasty, a strong wind (to blow)
4) "You (to choose) a topic for your composition?" -"Not yet"

1) "Have you woken the children?" -"Not yet, they are still sleeping"2) You are late, the lesson have already begun.3) The weather is nasty, a strong wind have blown.4) "Have you chosen a topic for your composition?" -"Not yet"