Which tense to use or might both be correct? "...I am currently travelling with Liam, a student from Leeds University in England. He is a nice guy, but impatient. He is always walking ahead of me and complaining that I am too slow. I do my best to keep up with him, but he is younger and stronger than I am." This is an extract from a rather popular exercise on Present Simple vs Present Continuous. And you can easily find answers on the Internet. Though, there is disagreement on 3rd and 4th sentences: he always walks (complains) or he is always walking (complaining); I do my best or I'm doing my best. I personally think that the third sentence refers to annoying habit so we should use Pres.Cont. And I just sense that I do my best is better but can't explain why)