Final answer:
The grammar mistake that incorrectly joins two independent clauses is a run-on sentence, which can be solved using a semicolon or period. Avoid comma splices, which similarly join two independent clauses with just a comma, by using the same methods.
Step-by-step explanation:
The grammar mistake that mistakenly joins two independent clauses is known as a run-on sentence. This error can often be corrected with the use of a semicolon or period. A run-on sentence occurs when two or more complete sentences are combined without adequate punctuation or conjunction. To fix this, you can add a coordinating conjunction, separate the sentences with a semicolon, use a transitional phrase along with a semicolon, or turn one clause into a subordinate clause.
It's important to note that a comma splice is another similar mistake where two independent clauses are erroneously joined by a comma. This too can be corrected by the methods described for run-on sentences, including the use of a period, a semicolon, or by adding an appropriate conjunction.
Here are examples illustrating the use of a semicolon to correct these issues:
- Incorrect: It rained heavily during the afternoon, we still managed to have a picnic.
- Correct: It rained heavily during the afternoon; however, we still managed to have a picnic.
- Correct: It rained heavily during the afternoon. We still managed to have a picnic.