i often watched TV until midnight.(同义句转换) I( ) ( )watch TV until midnight.

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i often watched TV until midnight.(同义句转换) I( ) ( )watch TV until midnight.
i often watched TV until midnight.(同义句转换) I( ) ( )watch TV until midnight.

i often watched TV until midnight.(同义句转换) I( ) ( )watch TV until midnight.
did not (I did not watch TV until midnight.)
until在英语中主要有两种用法,一是介词,二是连词,而连词又分为肯定句和否定句.
在这里如果考虑是介词或者肯定句,那么需要借助持续动词,也就是说不管watch之间是什么单词,watch必须是ing格式,而从这里看,watch显然不能跟上used to这个词,因为used to后面应该跟动名词形式.
我认为这里考察的是until的否定形式用法,就是用didn't 句式,从句先发生,主句后发生,表示“直到……才”的意思.

used to

usually / frequently

often =usually=经常
连接用 to
所以 I usually to watch TV until midnight.
liutao200910 说的只是第一个空
usually / frequently
都是经常的意思。