+ (-le了) + complement of frequency + (le了)
Specifying how many times the object has been or is to be dealt with.
10.1 Tā bǎ zhèi ge
shí biàn, háishì jìbúzhù.
She copied this character ten times, but she still can’t remember it.
10.2 Wǒmen yǐngjīng bǎ zhèi ge wèntí
sān cì le.
We have already discussed this issue three times up to now.
10.3 Bǎ zhè piān kèwén niàn sān biàn.
Read the text aloud three times.
10.4 Bǎ zuòyè jiǎnchá
Check your homework.
Note: Yíxià一下(a little bit) is a special verbal measure word. It is generally used to soften the tone in imperative sentences. It is not used to indicate the frequency of an action. So it is wrong to say, ‘bǎ zuòyè jiǎnchá liǎng xià’ 把作业检查两下(check the homework twice).