[译] 医生建议他要做一些轻微的体力劳动。
[误] The doctor recommended that he must do some light manual labour.

[正] The doctor recommended that he should do some light manual labour.
[注] 根据 recommend 的用法要求，当它后面跟有宾语从句时，该从句中的谓语动词应用虚拟语气，即“should + 动词原形”。