Questions & Answers about Mój brat zawsze dzwoni wieczorem.
Why is the verb dzwoni instead of dzwonię?
Dzwoni is the "he/she/it" form of the verb dzwonić (to call). This verb belongs to the -ę/-isz group you are learning right now. Because the subject is mój brat (my brother = he), we use the third-person form. For comparison: "I call" is dzwonię and "you call" is dzwonisz.
Why is "in the evening" just one word, wieczorem?
The basic noun for "evening" is wieczór. In Polish, to say that something happens during a certain time of day, you usually change the word's ending rather than using a separate word for "in". Changing wieczór to wieczorem (using a grammar form called the instrumental case) turns it into "in the evening".
Does dzwonić mean "to call" on the phone, or "to call" someone by their name?
Dzwonić specifically means to call on the phone (it literally means "to ring"). If you want to talk about what someone is called, like their name, you need a completely different verb: nazywać się.
Can I change the word order and put zawsze at the end of the sentence?
Yes, Polish word order is very flexible! You could say Mój brat dzwoni wieczorem zawsze. However, putting adverbs of frequency like zawsze (always) right before the verb is usually the most natural-sounding choice.