Let's go swimming!这个swimming为什么要ing?

Let's go swimming!这个swimming为什么要ing? let's go hiking ()of going swimming What l______ weather!Let's go swimming. let's ______(go) swimming after school let us go and swimming.哪里错了let 's go and swimming.let's go swimming 三个当中有哪个用法不对 let's go swimming,shall we?改写同义句[ ] [ ] go swimming? Let’s go swimming.(改为现在进行时) Let's go swimming this afternoon.改成翻译疑问句 Let's go swimming on Sunday.的同义句 let's go swimming at this weekend改为否定句 It is i----beautiful weather.let's go swimming.急 let's -----(go) swimming after school.这个动词怎样填.有after shool .是将来时态吗? 同义句变换：Let's go swimming 变为：什么 about 什么 swimming 同义转换：Let's go swimming.=____ ____ going swimming? Let's go swimming this afternoon.改同义句( ) ( )going swimming this afternoon.急 Let's go swimming this sfternoon.改为同义句----- ---- going swimming this sfternoon? Let's go to swim .跟 Let's go swimming .那go to swim 是固定搭配吗？ 英语选词填空：Let's go ___(swim,swimming).Let不是要加动词原形吗，为什么选swimming？