life's too short not to live.

is縮寫&所有格

my sister's boyfriend

所有格

Linda's his sister

is縮寫

too...to... &? not too...to & too...not to

too .. to ... 太... 以至于不能...

too adj/adv to do

he is too old to work.

English is not too difficult to learn.

so...that & too...to

so...taht...

如此...以至于

the weather is so cool that people have to stay at home

時態(tài)是否要保持一致？
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