Hussein Hassan posted:a) He usually goes to work by bicycle.
b) He'll usually go to work by bicycle.
Hello, Hussein and Gustavo,
I like your response, Gustavo. This is meant as a supplementary comment. I thought of a context in which I might actually use (b). It is not a context in which (a) could replace it.
Let's suppose, Hussein, that I know "him" really well. I know his habits. I know what he usually does and what he sometimes does instead. Let's also suppose that he is coming to stay with you awhile. I might say:
b) He'll usually go to work by bicycle. But occasionally he will take his car.
In that context, I'm letting you know what to expect. I am forecasting his future habits for you, on the basis of what I know about him. I could phrase things using the present tense, but the meaning would change. I wouldn't be forecasting.