There are 3 grammatical errors. The first sentence: have you ever run in a relay race.
When you start a sentence, you need to start it with a capital letter. This sentence is asking a question, so you need to add a question mark.
There are two grammatical errors. 'Run' is used in present tense instead of the past tense 'ran', and there should be a question mark at the end of the first sentence.
