Expand your vocabulary without learning brand new words
A verb has many forms. Aside from its tenses, it can possess a completely different meaning when added a preposition or adverb. Examples of these verbs are go over, go through, run across, run into, run out, go back, go on, and so on.
These are called phrasal verbs. You can use these verbs to expand your vocabulary without learning completely new words. You can find a profound list of phrasal verbs through this link, but below are few examples you can start with.