1 We usually _____(have) six lessons a day and each of them ___(last)45 minutes要原因

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1Weusually_____(have)sixlessonsadayandeachofthem___(last)45minutes要原因1Weusually_____(have)sixlessons

1 We usually _____(have) six lessons a day and each of them ___(last)45 minutes要原因
1 We usually _____(have) six lessons a day and each of them ___(last)45 minutes
要原因

1 We usually _____(have) six lessons a day and each of them ___(last)45 minutes要原因
have (we是复数,后面的动词用原形)
lasts (each of them为单数,后面的动词加s)

have lasts

usually说明上经常发生的事,即应该用一般现在时态..只需要考虑三人称单数的变化.
第一空前面是we不是三人称单数,直接填have,
第二空,each of them.只每一门课..是单数,所以last加s,变为lasts

have
此句为一般现代时且主语为复数 故动词用原形
lasts
此句为一般现代时且主语为单数 故动词用单三形式

have :因为we是主语,have是we的动词
lasts:因为each引导的词组都当单数讲

have lasts

have,主语是we,宾语用have
lasts,主语是each,宾语用单三