We need to put a noun after a preposition. Gerunds act as nouns, so after a preposition, we can also put a gerund. There are many expressions that are commonly followed by a gerund. Let's take a look at the most common ones. Here are some expressions that use "be verbs". The "be verb" can be used in any verb tense and can be made negative by using the word "not". ADJETIVE + PREPOSITION Examples: She is excited about going to the party. I am tired of working here. He is angry about many tasks. VERB + PREPOSITION Examples: I am worried about losing my job. She complained about having to work last weekend. We talked about hiring another employee. He apologized for being late. We believe in helping others.