Birds are seldom heard _____at night.A.sing B.singing C.to sing D.to be singing

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Birds are seldom heard _____at night.A.sing B.singing C.to sing D.to be singing
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Birds are seldom heard _____at night.A.sing B.singing C.to sing D.to be singing
Birds are seldom heard _____at night.
A.sing B.singing C.to sing D.to be singing

Birds are seldom heard _____at night.A.sing B.singing C.to sing D.to be singing
感官动词可以接宾语加宾补的结构：感官动词＋sb + do/doing sth.
但感官动词＋sb + do sth.在被动语态中不定式符号to不能省略．题中有seldom,所以主动语态中用原形,被动语态中用to sing .答案为C
eg:the boy was last seen playing by the river.(这里last说明看到的是正在进行的动作,所以用v-ing.)

sing

C
这里讲的是一种经常的状态，所以应该用hear sb do sth的结构，改为被动后，就要在sing前面加to

C
hear sb do sth 句型用于被动要还原to
没有必要用进行时

C
这是被动语态,动词不定式不能省to
hear sb. (to) do sth.

b

C
你的这个问题和notice sb do 变为被动语态一样，
要把省去的 to 还回来。
hear sb do
watch sb do
see sb do
make sb do
一样

Birds are seldom heard _______at night.A.sing B.singingC.to sing D.to be singing Birds are seldom heard _____at night.A.sing B.singing C.to sing D.to be singing hea penguins are birds,but they are not l____ most birds. They are birds 写出问句 are the birds in the Where are the birds中文 you are birds and beasts hea的hea是什么意思 hea的hea是什么意思 hea是什么意思 hea是什么意思? hea是什么意思? Birds There are some birds s___in the tree. there are many birds in the sky There are some birds singing( )the trees there are three birds in the