There is a accident happen on the school gate .这个句子本身正确吗?如何改

There is a accident happen on the school gate .这个句子本身正确吗?如何改 man,women,a,three,gate,school,the,at,and(用there is组句子） A traffic accident ______(happen)on the road On the beach,there is always someting __. A.happen B. happen 一1 Mr liu there is a () for you at the school gate 2 Lucy is .There is a ___________at the gate of the school .(oitnec] 组 I saw an accident happen on my way home 改句子 There is a boy ____(wait) for you at the school gate? There is an_____(inform)board near the school gate. 这个句子正确吗?There is no denying that to be a parent is by on mea There is bread on the plate.这个句子有毛病吗? When () the accident ()?A.was,happen B.did;happen C.is;happe