辨析keep
辨析keep doing sth？
doing sth？
不应该。
完整句子是continue to keep watch at the door. 拆分一下，continue to do something, keep watch at the door是行为，跟常用的keep an eye on you的keep是同一个意思。keep doing是一直做某事，原文里的keep是保留，留着的意思。脱开句子看固定搭配的都是流氓。
keepup的用法？
keep on doing sth持续做某事keep up 保持，沿袭后接名词或代词，接代词时放在up前
keep doing sth 怎么在句子中使用？
一、 keep doing sth. 意为继续干某事，表示不间断地持续干某事，keep后不能接不定式或表示静止状态的v-ing形式，而必须接延续性的动词。如：
1）He kept working all day, because he wanted to finish the work on time.
他整天都在不停地工作，因为他想准时完成工作。
2）Keep passing the ball to each other, and youll be ok.
坚持互相传球，你们就行。
on doing sth. 意为持续做某事。如：
1)The pupil kept on asking me the same question.
这个学生不断地问我同一个问题。
2)I kept on thinking about the match in the afternoon.
我总是想起下午的那场比赛。
doing sth.意为阻止/防止……做某事。如：
The heavy snow kept us from going out.
大雪使我们不能出去。
keepondoingsth的造句？
You must keep on working hard until you gain your goal.
Ikeepdoingsth造句？
1、My teacher kept me doing my homework all the afternoon.我的老师要我整个下午都做作业。
2、I should keep exercising.我们应该保持锻炼。
3、I always keeps smiling .他总是保持微笑。
4、Just keep on doing it.坚持干下去，你也能做得很好。
5、If i keep on doing evils, ill reap what i sow.如果他们继续作恶, 必将自食其果。