原句：A new survey shows that 54 percent of Americans do not take prescription medicines as instructed though they are important to their health.
在這句句子中,主句是：A new survey shows ,主語(yǔ)是a new survey
that引導(dǎo)的是賓語(yǔ)從句,指shows的內(nèi)容.that 54 percent of Americans do not take prescription medicines as instructed though they are important to their health.是賓語(yǔ)從句,主語(yǔ)是54 percent of Americans .
在賓語(yǔ)從句中還有一個(gè)從句,由though引導(dǎo),從句是they are important to their health.而這句從句主語(yǔ)是they,指代prescription medicines
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