3．If my armtouches（觸摸） the wall，I have to wash it again．

分析 如果我的手臂觸到墻，我必須再洗一次．

解答 答案：touches．if引導(dǎo)的條件狀語從句，主句含有情態(tài)動詞，從句用一般現(xiàn)在時，主語my arm，touch動詞，故touches．

點評 If條件句使用如下：
1．主語用一般將來時，從句用一般現(xiàn)在時表將來；
2．主句一般現(xiàn)在時或含情態(tài)動詞can，may，must，should等，從句一般現(xiàn)在時；
3．主句為祈使句，從句也常用一般現(xiàn)在時．

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