when+doing 还是when+to do sth.

when+doing 还是when+to do sth. when i do还是when i doing when to do和 when doing的区别是什么 when it comes to后面是+do还是doing还是名词 when it come to 当谈到,后面接do 还是doing when引导的时间状语从句后加doing 还是 to do? when引导的时间状语从句后加doing 还是 to do? when sb.do sth.还是 when sb.doing sth.如When my mother ________(cook) meals for us in the kitchen I often go there to help her. 帮忙用was/were doing .when ; be about to do.when;had just done.when造句, had juest done..when ,were/was doing..when,be about to do ..when 啥意思啊 when doing sth 还是 when do sth (语法问题)这句话：we consider it as constant when computing the signal to noise ratio.还是we consider it as constant when compute the signal to noise ratio be doing sth.when what were you doing when he came to see you? When it comes to doing business为什么to后面是doing?不应该是to 是：Only when you learn in a fun way （will you） want to keep on doing it 还是：Only when you learn in a fun way （you will） want to keep on doing it when to 用be+doing +when be用be+doing +when be +about to do+when.be+On the point of doing +when.has just done +when +did..各造两个句子! 可不可以用be doing,when be doing?