回复：大家是怎么克服的这些口语问题？

Have to say it enough times to build a pattern in your mind.
I made all those mistakes the first year I started speaking English. But now, I'd never say 'a apple', the 'an apple' pattern has been built up, every time I think of 'apple', 'an' will pop up in front right away.
Totally agreed with lilac, linking definitely helps.