看来你是全混淆了.没事,别乱!
其实告诉你两个词组的用法你就全明白了：
1、used to do(“过去常常做某事”---过去时态)
2、be used to doing(“习惯于做某事”---一般现在时态)
Q3.use（使用v.）、used（“习惯”的过去式,即“过去习惯”）、useful（有用的）、user（用户）、useless（无用的）
Tom is used _____(run) for 30 minutes on the playground ever
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