I am (n ) happy.because my pencil case is(l )

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I am (n ) happy.because my pencil case is(l )

I am (not ) happy.because my pencil case is (lost )

not lost

I am (not) happy.because my pencil case is(lost ) .我不高兴,因为我铅笔盒丢了。或者( I am not happy, because I lost the pencil case)

not lost 我不高兴 因为我的铅笔盒丢了