several times so far. 3.What time _w_i_ll_ the meeting __b_e_g_in__(begin)? 4.It __co_s_t_s_ (cost) 100 Yuan. 5.Water the flower soon, or it _w_il_l _d_ie_(die).
see/hear/notice sb. do sth. sb. be seen/heard/noticed to do sth.
let/make/have sb. do sth. sb. be let/made/had to do sth.
• The boss makes the workers work all day. The workers are made to work all day.
3,主动语态中“动词+介词”或“动词&hey look after the girl well. The girl is looked after well by them.
He often laughs at the poor boy. The poor boy is often laughed at by him.
The river is polluted seriously
Some trees are cut down.
A sports meeting is held in our school every year.
The whale is killed for its fin.
1,感官动词、使役动词等在主动语态中后接零动词不定式 变成被动语态时要加上“to”
6,每天早晨都能听得鸟儿的叫声。 Some birds are heard to sing every morning. 7,每天有很多病人要动手术。 Many patients are operated on every day. 8,这款新手机很好销售。 The new kind of mobile phones sells well.