help sb do sth和help sb to do sth都可以,那么I have to help my parents do the housework every day

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• help sb do sth和help sb to do sth都可以,那么I have to help my parents do the housework every day中的do为什么要用with,永do是错误的呢?
• help sb do sth和help sb to do sth都可以,那么I have to help my parents do the housework every day
• CH3COONa溶液中加入适量CH3COOH使混合液PH=7,此时溶液中C（NA+)=C(CH3COO-).为什么呢?
• 用物质的量都是0.1mol的CH3COOH和CH3COONa配制成1L混合溶液，已知其中c（CH3COO-）＞c（Na+），对该混合溶液的下列判断正确的是（　　） A.c（H+）＞C（OH-） B.c（CH3COOH）+c（CH3COO-）