1. used to do 过去经常…，曾经…
He used to be my best friend, but now we are like strangers to each other.
他曾经是我最好的朋友，但现在我们彼此就像陌生人一样。
2. get/be used to +n/doing 习惯于…
used adj 习惯的
She just got here, and she’s not used to the food here yet.
她刚到这，对这里的食物还不习惯。
I used to run in the morning everyday, so I was used to getting up early.
我以前每天早晨都跑步，所以我习惯了早起。
3. be used to do 被用来…
The water was used to water flowers. 这些水被用来浇花了。
读音
used to 连读
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