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

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Birdsareseldomheard_____atnight.A.singB.singingC.tosingD.tobesingingBirdsareseldomheard_____atnight.

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