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 want to finish work early tonight.
To solve this, we need to identify the verb in the sentence and determine the appropriate form to use. In this case, the verb is "want" and it is followed by the infinitive "to finish." We use the infinitive without any changes because "want" requires another verb to follow it.

I hate waiting for buses in the rain.
Here, the verb is "hate" and it is followed by the gerund "waiting." We use the gerund form because "hate" is a verb that can be followed by either an infinitive or a gerund, but in this case, it is followed by a gerund.

I'm going to the café to meet Anna.
In this sentence, the verb "go" is followed by the preposition "to" and the infinitive "meet." Again, we use the infinitive in this case because "go" requires another verb to follow it.

Sam is really good at climbing.
The verb "good" is followed by the preposition "at" and the gerund "climbing." Similar to the previous sentence, we use the gerund form because "good" is followed by a gerund.

Thank you for being so helpful.
Here, "thank" is followed by the preposition "for" and the gerund "being." We use the gerund form because "thank" is followed by a gerund.

I enjoy listening to the radio while cooking.
The verb "enjoy" is followed by the gerund "listening." We use the gerund form because "enjoy" is a verb that is usually followed by a gerund.

Let's go now. I'm worried about missing the train.
The verb "worry" is followed by the preposition "about" and the gerund "missing." Again, we use the gerund form because "worry" is followed by a gerund.

He refused to help me.
In this sentence, the verb "refused" is followed by the infinitive "to help." We use the infinitive because "refused" requires another verb to follow it.

Remember, verbs can be followed by infinitives or gerunds depending on their meaning and usage. It is important to understand the different forms and know when to use each one.