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the trees look beautiful he saw the beautiful trees and he saw the beautiful trees the tree was seen by him
为变量赋值：$FRUIT=apple 显示变量的值：fruit=apple 显示变量的值：echo $FRUIT 判断变量是否有值：[-f“$FRUIT”]
is；is are；is is；are are; are
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come comes is coming are coming
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sharpened ripened matured grown
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looking looked look to be looked
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fruit shop clothes store shoe store book shop
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