Put the verbs in brackets into the gerund or the infinitive.
I want (finish) work early tonight.
I hate (wait) for buses in the rain.
I’m going to the café (meet) Anna.
Sam is really good at (climb).
Thank you for (be) so helpful.
I enjoy (listen) to the radio while cooking.
Let’s go now. I’m worried about (miss) the train.
He refused (help) me.

I would be happy to help! Here are the answers to the exercise:

1. I want to finish work early tonight.
- In this sentence, "want" is followed by the infinitive form of the verb "to finish." We use the infinitive after certain verbs, such as "want," to express a desire or intention.

2. I hate waiting for buses in the rain.
- In this sentence, "hate" is followed by the gerund form of the verb "waiting." We use the gerund after certain verbs, such as "hate," to express a general dislike or annoyance.

3. I’m going to the café to meet Anna.
- In this sentence, "going" is followed by the infinitive form of the verb "to meet." We use the infinitive after the verb "to go" to express a purpose or goal.

4. Sam is really good at climbing.
- In this sentence, "good at" is followed by the gerund form of the verb "climbing." We use the gerund after certain adjectives, such as "good at," to talk about abilities or skills.

5. Thank you for being so helpful.
- In this sentence, "thank you for" is followed by the gerund form of the verb "being." We use the gerund after "thank you for" to express gratitude for someone's actions or behavior.

6. I enjoy listening to the radio while cooking.
- In this sentence, "enjoy" is followed by the gerund form of the verb "listening." We use the gerund after "enjoy" to talk about activities that give us pleasure.

7. Let’s go now. I’m worried about missing the train.
- In this sentence, "worried about" is followed by the gerund form of the verb "missing." We use the gerund after certain prepositions, such as "about," to express concerns or worries.

8. He refused to help me.
- In this sentence, "refused" is followed by the infinitive form of the verb "to help." We use the infinitive after certain verbs, such as "refuse," to express a refusal or denial.

I hope this explanation helps! Let me know if you have any further questions.