Your sister is often heard_to sing___(sing) English songs in the afternoon.
hear sb.do 变被动,要加to
One of the cleaners _was removing____(remove) the snow from 5 to 7 yesterday morning.
昨天5点到7点是过去进行的时间状语
The boy is very happy because all the newspapers_have beensold___(sell)out already.
aleady已经,是现在完成的时间状语
There _are going to be____(be)two football matches in your school tomorrow ,are there?
将来时,而且后面反义疑问句用are,所以前面用be going to
How many magazines can _be borrowed__(borrow) in your library every week?
情态动词的被动语态
John_was heard____(hear)to go upstairs two hours ago.被动语态
Who _saved__(save) her father?He _was saved___(save)by that policeman.过去时被动语态
Mooncakes _are made___(make)by his mother every year.一般现在时的被动语态
The boy _is made___(make)_to stay___(stay)at home.一般现在时的被动语态
The computers in that shop __sell___(sell)well.sell与well连用,用主动语态表示i被动意义
They should _be helped___(help) when they are sick.情态动词的被动语态
不明白,