B1 B2 C1 C2

Part of what makes the tense system in English complicated is how it interacts with adverbs... and part of what makes adverbs complicated is how they interact with the tense system.

The alternative, more optimistic, perspective is that the interaction between verbs and adverbs gives the learner a definite set of tools to help him or her understand how they work. So, let's take the optimistic route and see how they work together. To do so, we'll look at how 'for', 'since' and 'ago' interact with both the perfect and the past simple verb forms in English.