Giúp mình với các bạn ơi

`~rai~`

\(\text{15.If you often talked to them,they would understand you.}\\\text{16.If you didn't speak English unnaturally,they would understand you.}\\\text{17.If you turn off the lights,you will not pay more money.}\\\text{18.If you aren't careful,you may have an acident.}\\\text{19.If you don't phone your parents,you will have a trouble.}\\\text{20.If you stay here,you will feel save.}\\\text{21.If you don't pay electricity bill today,you electricity will be cut off.}\\\text{22.If you don't stop smoking,you cough may be worse.}\)