i(am used to)(used to)swimming in cold water.

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i(am used to)(used to)swimming in cold water.
i(am used to)(used to)swimming in cold water.

i(am used to)(used to)swimming in cold water.
应该用“am used to”
be used to doing sth 意思为“习惯做...",此处的 ”to“为介词,后面跟动名词;
used to do sth 意思为“过去常常做...”,此处的“to”为不定代词,后面跟动词原形.

am used to------------------习惯于

am used to

am used to doing 习惯于做某事

am used to
be used to doing 习惯做某事,后面跟动名词
used to do 跟动词原形,是表示过去常做的动作