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understand understood would understand had understood
did I understand I understood I did understand have I understood
understand understood would understand had understood
did I understand I understood I did understand have I understood
mustn’t needn’t cant’t couldn’t
I understand did I understand I did understand have I understood
understood with understand with understood in understand in
can; must can; cant may; mustn′t must; can′t
understood with understand with understood in understand in
did understand I understood I did understand have I understood
did I understand I understood I did understand have I understand
understand；understand understand；understood to understand；understand understand；to be understood
What I can’t understand it That I can’t understand What I can’t understand Which I can’t understand it
To be; understand I'm ;to understand Being ;understanding Being; understood
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