Like and As if/As though Like, as if and as though can all be used to make comparisons. There is no difference in meaning among the 3 forms. You look as if you’ve seen a ghost. You talk as though we’re never going to see each other again. It looks like it’s going to rain.

whenas (wɛnˈæz) conj 1. a. when; whenever b. inasmuch as; while 2. whereas; although

Can you give a little more information? I'm not sure what you are looking for. If you give some examples, I could correct them or explain them.