It is dangerous swimming in the sea in stormy weather.be dangerous 后面不是应该接to do 这里dangerous后面为什么不用to do,而用doing 形式

It is dangerous for little children to swim in the river.为什么这里用to swim lake near our village is _______.It is dangerous to swim in it. in,is,swim,children,to,river,the,dangerous,it,really,for连词成句. To swim in this river is very dangerous(用IT作形式主语改写句子） you needn't swim in the river .it is dangerous错在哪啊? The river is too dangerous.You can't swim in it.合并两个句子为1句 it is dangerous for children to swim alone.为什么用 alone?动词后不应该跟副词修饰吗 careful It is dangerous .能否写成Carefully It is dangerous . Don't swim in the l___ alone.It's dangerous. it's,swim,dangerous,to,alone(.) 连词成句 Don't swim in the river a( ) .It's dangerous it's,swim,dangerous,to,alone 连词成句 It is dangerous to swim here oh ,I ------it .Thanks for telling me .A haernt noticed B wont noticeC dont notice D didnt notice It is very dangerous to swim in the river.What can stop them _ doing that?Afrom B to C out ofD in The river is too deep for____ to swim in.It may be very dangerous.A anyone B nobody C no one D everybody the river is dangerous.you ___ swim in it .A.can't B.mustn't C.couldn't D.needn't It may be dangerous to swimin the pool alone同义句 ( ) it ( ) dangerous to swim in the pool alone. Is it very dangerous?的中文意思