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few little a few a little
understand understood would understand had understood
understand understood would understand had understood
I understand did I understand I did understand have I understood
few little a few a little
so; that such; that too; to very; that
understand understood to understand to be understood
did I understand I understood I did understand have I understand
understand；understand understand；understood to understand；understand understand；to be understood
don't; since didn't; since don't; until didn't; until
Because However But Though
What I can’t understand it That I can’t understand What I can’t understand Which I can’t understand it
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