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. Urge the person to get help. Find out what causes utis, how infections are treated and ways to prevent repeat utis.
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Help to do sth.：词性为动词短语，该短语中的help后面跟着不定式（to do），表示主动帮助他人完成某件事情。 help doing sth.：词性为动词短语，该短语中的help后面跟着动名词（doing），. 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. The boys do do their homework after school every day. A major difference between d.o.s and m.d.s is that some doctors of osteopathic medicine use manual medicine as part of treatment.
Statin side effects can be uncomfortable but are rarely dangerous.
