Do their homework 做作业，do do their homework 确实有做作业，主语是 they ，故用 do 对do their homework中的do 进行强调：确实有做。 Do和does的区别和用法区别是：do 是动词原形，用于第一人称、第三人称的复数 (i/you/we/they)。does 用于第三人称单数 (he/she/it) does 用于第三人称单数。do用于一般现在时且主语是复数we,they, 接下来让我们看下help do sth.、help to do sth.和help doing sth.的用法区别： 1.后跟动词形式：help do sth.后跟动词原形，help to do sth.后跟不定式（to do），help doing sth.后跟动名词（doing） 例.
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Means, but what does d.o. Do come in and sit down. Statins block an enzyme the liver needs to make cholesterol.
He did come here yesterday.
It is a type of meditation in which you focus on your thoughts, feelings, body and surroundings. He does come here every day. Do （务必）come on time next time. What's different and what's alike between these two kinds of health care providers?
But having too much cholesterol in the blood raises the risk of heart attacks and strokes. Do （务必）be careful next time. 现在完成时：have/has+done ， 过去完成时：had+done，现在进行时态：be动词＋doing，过去进行时（被动语态）：was／were＋doing， 一般现在时：do、does，一般过去时：did。 一、含义 v. The boys do do their homework after school every day.
Mindfulness is a state of being mindful and aware of the present moment.
