student asking question

In what situation can I use "since when"? And can I use "has" instead of "does"?

teacher

Native speaker’s answer

Rebecca

You can use "since when" when you are accusing someone of doing something he doesn't normally do. Here is an example conversation of using "since when." A: Since when have you liked watching baseball? B: I have always liked baseball. A: No you haven't. You hate baseball! You only watch it because of Tommy! To answer your second question, yes! You can use "has" instead of "does." However, just make sure to pay attention to the sentence so you aren't using the incorrect word. In the example that I used above, I used the base form of the verb "has." Thank you for your question!

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