新概念英语第三册-Lesson 29(课文3)
2, In the process, he enjoyed himself thoroughly and kept telling everybody how much he hated hospitals.keep doing sth. 不间断的，不停的做某事
keep on doing sth. 反复、重复干某事(中间可以有短暂的暂停) (keep: vi.)
Don't keep on asking silly questions.
He kept smoking all the while.
He kept on smoking all the while.
keep +宾语+动词ing形式，keep on 不能用于该句型
He kept me waiting for an hour.
I'm sorry to have kept you waiting so long.
3，He spent a miserable day in bed thinking of all the fun he was missing.
think of:想到，想起，想着
When I saw you I thought of my sister.
think of doing sth.
He is thinking of setting up a school.
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