I forgot to include the following two statements. Thank you very much for your help.

1)He believes a good slogan needs to be short,to have rhythm and above all to sound natural. That’s why slogans tend to go out of date very quickly. 2) He doesn’t want to get away from the pressure of the advertising industry because he thinks that being interested in what he does keeps him young, even though he sometimes feel tired or hurt by people’s criticisms.
3) Brutus believes that his role was in the assassination of Caesar was for the good of Rome
4) He fails to consider the crowd's attitude and feelings and that's why (? other choices?) his words sound ineffectual.
5) Don't change tenses in the middle of a sentences. When describing the various characters or mentioning their own views use the simple present. When referring to historical events you should shift (?) to the past.

1)He believes a good slogan needs to be short,to have rhythm and above all to sound natural. That’s why slogans tend to go out of date very quickly.

I would cnahnge this sentence to this

1) He believes a good slogan needs to be short, have rhythm, and above all, sound natural. That's why slogans tend to go out of date very quickly.

2) He doesn’t want to get away from the pressure of the advertising industry because he thinks that being interested in what he does, keeps him young, even though he can sometimes feel tired and get hurt by people’s criticisms.

I added a bit to this sentence.

3) Brutus believes that his role was in the assassination of Caesar was for the good of Rome

You're forgetting the period at the end. The rest looks fine. But, you don't need the was there. I'd change it to this.

Brutus believes that his role in the assassination of Caesar was for the good of rome.

4) He fails to consider the crowd's attitude and feelings and that's why (? other choices?) his words sound ineffectual.

He fails to understand the crowd's attitude and feelings which is why his words are sounding ineffectual.

What you have up there is good as well.

5) Don't change tenses in the middle of a sentences. When describing the various characters or mentioning their own views use the simple present. When referring to historical events you should shift (?) to the past.

Don't change tenses in the middle of a sentence. OR Don't change tenses in the middle of sentences. Whn describing the various characters or mentioning their own viwes, use the simple present. When referring to historical events, you should shift to the past. You could say move back to the past tense. OR use the past tense.

Brutus believes that his role in the assassination of Caesar was for the good of rome.

sorry about this sentence. Do capitialize Rome.

No problem! Here are the explanations for the additional statements:

1) The statement explains that the person believes a good slogan should possess certain qualities like being short, having rhythm, and sounding natural. It also mentions that slogans tend to go out of date quickly.

2) In this statement, the person expresses their view on why they do not want to get away from the pressure of the advertising industry. They believe that being interested in what they do keeps them young, despite sometimes feeling tired or hurt by people's criticisms.

3) This statement reflects Brutus's belief regarding his role in the assassination of Caesar. He believes that his action was for the good of Rome.

4) This statement highlights a possible reason why Brutus's words may sound ineffectual. It points out that he fails to consider the attitude and feelings of the crowd, suggesting that this might be the cause for his words not having the desired impact. The text mentions that there may be other choices, but they are not provided in the given information.

5) This statement provides a tip on how to maintain consistency in tenses while writing. It advises to not change tenses in the middle of a sentence and to use the simple present when describing the various characters or their views. However, when referring to historical events, it suggests shifting to the past tense. The text mentions that there should be a specific shift, but it does not provide the exact word or tense to use.