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返回课程 ASD-STE100（简化技术英语）规则部分Rule 5.4 If you start an instruction with a descriptive statement (dependent phrase or clause), divide that statement from the command with a comma.规则5.4如果指令以描述性语句（从属短语或子句）开头，用逗号将该语句与指令分开。

Sometimes it is only possible to do a work step under special conditions. If so, the reader must know about the condition first. Write the condition first in the sentence, and then use a comma to show where the condition ends and the instruction starts.


Examples in STE:


When the light comes on, set the switch to NORMAL.

When the surface is dry, apply the primer.

If the constant speed drive (CSD) does not operate correctly, disconnect it from the gearbox.

The comma is important. Be careful to use it correctly because it can change the meaning of your sentence.


Examples in STE:

If the constant speed drive (CSD) does not operate correctly, disconnect it from the gearbox.

If the constant speed drive (CSD) does not operate, correctly disconnect it from the gearbox.

As you can see from the examples, these sentences are correct but they mean two different things.

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