They swim in this swimming pool in summer.（改为否定句） That yellow bird does not fly here ervermorning（改为肯定句）

Many boys _____ (swim) in this river last year.But they can't now They are going to swim this afteinoon swim提问 Are they---------(swim)in the river now? They (swim;are swimming)in the river They swim in this swimming pool in summer.（改为否定句） That yellow bird does not fly here ervermorning（改为肯定句） This lake is very dangerous____.A.to swim in B.swim in C,to swim D.swimming They spent time _____(swim) in the river. They can swim in the river.(改为否定句） NO,they are swim in the river.(写出问句) They often watch fish ___ in the fish tank.(swim) they swim in the lake.人称改为he They swim in the sea every day 用now形式 They usually swim in the sea.(用now改写句子) They had a swim in the river.改为现在完成时 look they're having fun ----( swim) in the river?为什么要填swimming 而不是to swim? You can't swim in this river同义句如题. what about_(swim) in the lake this sunday is this river in which I can swim能不能换成is this river which I can swim in