他因病休学一学期，不得不努力学习好赶上别的同学。
After missing a term through illness he had to work hard to catch up with the others.
他因病休学了一个学期，他不可不努力学习赶上别的同学。（动作）
After missing a term through illness, he had to work hard to catch up with the others.
他因病休学了一个学期，他不可不努力学习赶上别的同学。（动作）
After missing a term through illness, he had to work hard to catch up with the others.
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