Planes have tried to catch them,but they always failed.为什么不能

Planes have tried to catch them,but they always failed.为什么不能 I tried to catch the bus,but failed.How__I was. They tried to run away but we---(catch)them in the end. 12.They tried to run away but we _______(catch) them in the they have always tried hard to.请解释一下这个句子的语法,为什么always在have的后 They tried to find the( ) computer,but they failed at last The robbers tried to run away,but we______(catch)them in the BUT GUS,THE KING'SON, ALWAYS TRIED TO CATCH THE BIRDA.是什么意思? They failed to catch the bus,___ ___?(反义疑问句） 为什么是didn't they He tried his best to quit smoking but he failed.这个句子对吗?为什么 they were all very tried,but none of them would stop to take but l door tried open failed to the连词成