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difficultest the most difficult the difficultest most difficult
your studying math you to study math for you to study math of you to study math
TE（i，j） TE（i） TE（j） TE（n）
at；on on；for for；in for；on
study studying learning studied
will study am studying was studying study
an; hard a; hard an; hardly a; hardly
am going to practice basketball am going to study math am going to take acting lessons am going to study computer science
By accident By mistake By the way By the time
study studying learning studied
Sorry, I can’t Yes, I can Sure, I’d love to No, I can’t
your studying math you to study math for you to study math of you to study math
am going to practice football am going to study math am going to take acting lessons am going to study computer science
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