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`1`You had better learn by heart new word everyday .

`=>`S + had better + V-inf + O ... 

`2` She enjoys listening to music .

`=>` enjoy `+`V-ing

`3`Let's go out for frehs air .

`=>` Let's `+` V `+` O

`4`You had better not ride your bike too fast .

`=>`S + had better + (not) V-inf + O ... 

`5`She doesn't entertain herself because she has no time.