Combine these simple sentences using parallel structure. the convict tried to plead with the guards. the convict shouted at the guards. the convict ended by threatening the guards.

The convict tried to plead with the guards, but he shouted at them and ended by threatening them.

Explanation:

Parallelism occurs when a text contains the same grammatical structure. In the example given, the three sentences are written in the Past Simple tense and indicate a series of finished actions in the past. As a consequence, they can be combined by adding the coordinating conjunction but to introduce a contrast, using pronouns to avoid repetition, and leaving the three main verbs in the Past Simple tense: tried, shouted and ended.  

the president was the speaker and it was a great part of history.

explanation:

video of the national aeronautic space administration's (nasa) coverage of president john f. kennedy’s address at rice university, houston, texas, concerning the nation's efforts in space exploration. in his speech the president discusses the necessity for the united states to become an international leader in space exploration and famously states, "we choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."

theres no poem plesae include that