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? be doing sth.when 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! 用be doing when do造5句 用when be doing/do/does句型造十个句子 用be doing when do造5句,是陈述句, 用be doing when do造5句,是陈述句, 用be+doing 造句^-^ 帮忙用was/were doing .when ; be about to do.when;had just done.when造句, Student are told _____ very careful when they are doing experiments. A should be B.be C. to be D.will be为什么选C,理由一定要详细.tell sb sth 为什么这里用to be 用 be doing 和be doing to do 造句 三个 用be doing tomorrow造句 用 Sb who do sth be like sb else doing sth else who,when/once.造句 如何对be doing sth when造句 Be doing sth when..一系列“正在做.忽然做.哪个加动词原形?哪个通常用在过去完成时?为什么Be doing sth when..be about to do sth when..be on the point of doing sth when..had done sth when 各举一个be+doing+while+be+doing和be+doing+when+did的例句,be最好为过去时 when he _____something useful,he wasted his time drawing little pictures.a.must have done b.shall be doing c.should be doing d.should have been doing be used to doing.be 可以用过去式吗?