however/thus/therefore的注意事項

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however/thus/therefore的注意事項

1. however表達「然而」的意思時，是副詞，不是連詞（表達「不管用什麼方法」的意思時是連詞），不能直接跟在逗號後面，而要跟在句號或分號後面；另外，however後面一般要加上逗號。

可以寫成：

The clinical response to treatment was good. However, the patient complained of steroid side-effects.

或

The clinical response to treatment was good; however, the patient complained of steroid side-effects.

不能寫成：

The clinical response to treatment was good, however, the patient complained of steroid side-effects.

另外，however可以作為插入語放在句中：

The patient, however, complained of steroid side-effects.

2. thus和therefore一般也是副詞，不能直接跟在逗號後面，要跟在句號或分號後面或者跟在and後面；它們後面一般也要加上逗號。

可以寫成：

Recurrence has been reported. Therefore (Thus), the patient should be monitored closely.

Recurrence has been reported; therefore (thus), the patient should be monitored closely.

Recurrence has been reported, and, therefore (thus), the patient should be monitored closely.

Recurrence has been reported, and therefore (thus) the patient should be monitored closely.

不能寫成：

Recurrence has been reported, therefore (thus), the patient should be monitored closely.

另外，therefore/thus 也可以放在句中:

The patient therefore (thus) received chemotherapy.

It is therefore (thus) likely that the adverse reaction is secondary to reduced responses to the treatment.

therefore/thus還可以接動名詞作為補語：

The patient had a recurrence, therefore (thus) experiencing more pain.