Grammar
We use since to talk about an action from some indicated time in the past, up to the present time. Therefore, the present perfect tense of the verb (e.g. has worked) is required. For refers
Grammar
We use can or be able to for saying that somebody or something has the ability to do something. We use may or could to talk about the possibility of something in the present or
Grammar
We can use the present continuous to talk about the future when we have already arranged to do something. We can use be going to to talk about something that we have decided to do
Grammar
We use the present continuous for things that are happening at the time we are speaking, for temporary situations, and for activities that are in progress.
