先不说语法问题,翻译成中文看下啊,
如果你想和人更好交流的话,你就可以做我以前建议的事儿.
如果你能和人更好交流的话,你就可以做我以前建议过的事情.
If you can communicate with others better,you can do what I've suggested.
如果你想和人更好交流的话,你应该做我以前建议过的事儿.
If you want to communicate with others better,you should do what I've suggested.