英语语法宝典
系统掌握英语语法，轻松提升语言能力
Present Simple Tense
基础时态
Present Simple Tense (现在简单时) is used to express:...
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Present Continuous Tense
基础时态
Present Continuous Tense (现在进行时) is used to express:...
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Passive Voice
中级语态
Passive Voice (被动语态) is used when:...
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Relative Clauses
中级从句
Relative Clauses (定语从句) are used to:...
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First Conditional
中级条件句
First Conditional (第一条件句) is used to:...
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Modal Verbs
基础情态动词
Modal Verbs (情态动词) are used to express:...
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Present Perfect
中级时态
Present Perfect (现在完成时) is used to:...
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