Поставить глаголы в pres. simple: 1) the to be) open, be) closed. 2) my mother (not to like) coffee with milk. to like) green tea. 3) be) schoolchildren. to be) students yet. (you,to like) ice-cream?

1) The window is not(isn't) open, it is(it's) closed.
2) My mother does not(doesn't) like coffee with milk. She doesn't like green tea.
3) We are(we're) schoolchildren. We are not(aren't) students yet.
4) Do you like ice-cream?