what is a declarative sentence and a complex sentence?

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http://www.writingcentre.uottawa.ca/hypergrammar/sntpurps.html

a declartive you delcare

ex i had chips today for klunch.
it has twqo subjects and 2 predicate it might look like a runon but don't get the two confused
ex molly wants a fish sanwhich at bee resturant while her bother mathew wants fries from buger king

A declarative sentence is a type of sentence that makes a statement or expresses a fact, opinion, or idea. It is the most common type of sentence in the English language.

On the other hand, a complex sentence is a sentence that consists of an independent clause and one or more dependent clauses. An independent clause is a complete thought that can stand alone as a sentence, whereas a dependent clause needs an independent clause to complete its meaning.

To identify a declarative sentence, you can look for a sentence that expresses a statement or fact rather than a question, command, or exclamation. Declarative sentences often end with a period.

To identify a complex sentence, you should look for a sentence that contains both an independent clause and at least one dependent clause. The dependent clause may start with a subordinating conjunction (e.g., because, although, if) or a relative pronoun (e.g., who, which, that).

Here are some examples to help illustrate the difference:

Declarative sentence:
- "The sun is shining." (This sentence simply states a fact.)

Complex sentence:
- "Although it was raining, I went for a walk." (This sentence has both an independent clause, "I went for a walk," and a dependent clause, "Although it was raining.")