Swimming there is dangerous 这句话对么?

Swimming there is dangerous 这句话对么? is there anybody in there 这句话对么 There is a couple of Children这句话对么?为什么?There is a pair of sh hao often do you swimming?这句话对么? swimming in the sea is very dangerous.There are some sharks swimming is not so dangerous as diving Swimming in the river is dangerous 主语是Swimming吗 there is danger 与 there is dangerous It is 3066 now. 这句话对么? It is dangerous in here这句话对吗 swimming is more dangerous than running改为同义句 I think swimming is more dangerous than playing table tennis