get sb down 后面接 to do sth 还是doing sth?还是其他的?

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get sb down 后面接 to do sth 还是doing sth?还是其他的?

down 是介词 介词后跟名词 或是动词的ing形式
所以跟 doing sth.

get down to 开始认真做
这词组是指‘开始做某件事’;想转移话题谈正事或做正事时即可说:"get down to business"或"get down to work"。"to"在此为介词,后面要接名词或动名词。
We have a lot of important work to do, so let's get down to the main problem.

get sb. down 是使某人沮丧,低落的意思,后面不加介词to;
get down是着手做某事的意思,如get down to (sth./doing sth.)

It should be "get down to doing" or "get down to sth.".