Answer:
We won't have anything to give our children unless we do something to protect what we have.
Explanation:
Every sentence must contain a subject and predicate and express a complete thought. A grammatically correct sentence is a sentence that follows all rules of grammar.
Here, we have mixed up words that need to be properly arranged in order to make sense (i.e. to express a complete thought) and follow said rules. The given sentence is made up of two clauses - one independent and one dependent clause, which makes it a complex sentence. Both of these clauses contain a subject and predicate, which must agree in number.
These are the things that we need to keep in mind when trying to put a sentence together.
