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might have spent must have spent could have spent should have spent
the boy stopped crying stopped the boy crying the boy did stop crying did the boy stop crying
Not only the boy turned up Not only the boy turned out Not only did the boy show out Not only did the boy show up
spent; must have been cost; ought to have spent wasted; wouldn’t have been took; can’t have spent
one wheel two wheels three wheels four wheels
IL-12分泌不足，使得Th0不能向Th1细胞分化 IL-12分泌不足，使得Th2向Th1细胞分化 IL-12分泌过多，使得Th0不能向Th1细胞分化 IL-12分泌过多，使得Th0向Th2细胞分化 IL-12分泌过多，使得Th2不能向Th1细胞分化
during which when in which which
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play playing played to play
IL－12分泌过多，使得Th0不能向Th1细胞分化 IL－12分泌不足，使得Th0不能向Th1细胞分化 IL－12分泌过多，使得Th0向Th2细胞分化 IL－12分泌不足，使得Th2向Th1细胞分化 IL－12分泌过多，使得Th2不能向Th1细胞分化
might have spent must have spent could have spent should have spent
might have spent ought to have spent must have spent could have spent
to lock locking having locked locked
might have spent ought to have spent must have spent could have spent
the boy is,he is is the boy， he is the boy is， is he is the boy， is he
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