Sentence structure mistakes

These geopolitical practices were common during the 19th C, they disappeared during the 20th century in spite of their importance in geopolitical analysis.

• comma splice

• run-on sentence

• correct sentence

• pronoun-antecedent agreement

Answer explanation

There are two main clauses joined only by a comma.

Neither a mutually peaceful relationship nor a non-violent conflict resolution mode seem the norm for some countries worldwide.

• correct sentence

• run-on sentence

• subject-verb agreement

• pronoun-antecedent agreement

Answer explanation

When we have an alternative correlative, the verb must agree with the closest subject.

Some crisis and military deployments.

• fragment

• run-on sentence

• subject-verb agreement

• correct sentence

Answer explanation

There is no verb.

Argentine and Chilean mutually exclusive claims in Antarctica have threatened Argentine geopolitical dreams over the Western South Atlantic and Argentine honor and national identity have been perceived as threatened by Chilean attempts over the territory.

• correct sentence

• faulty parallelism

• subject-verb agreement

• pronoun-antecedent agreement

Answer explanation

The unparallel structure lies in the unnecessary use of active and passive voice:

...have threatened Argentine geopolitical dreams over the Western South Atlantic and Argentine honor and national identity have been perceived as threatened by Chilean attempts over the territory.

Each country and community in zones of peace and pluralistic security maintain rich and reliable communication channels.

• fragment

• correct sentence

• subject-verb agreement

• pronoun-antecedent agreement

Answer explanation

When "each" and "every" precede singular nouns joined by "and", the verb remains singular.

The collected information, in addition to the conclusions of the analysis, were presented to the audience.

• faulty parallelism

• correct sentence

• subject-verb agreement

• pronoun-antecedent agreement

Answer explanation

The grammatical number of the subject is not changed by the addition of intervening phrases.