Because vs Because Of Exercises

Because and because of both give reasons, but they follow different grammar. Because is a conjunction followed by a clause (subject + verb): "I stayed home because I was ill." Because of is a preposition followed by a noun or noun phrase: "I stayed home because of my illness." The meaning is the same — only the grammar changes. This is the same pattern as "although" (conjunction + clause) vs "despite" (preposition + noun), which makes it easier to learn both pairs together.

A very common mistake is mixing the two patterns — writing "because of I was ill" (wrong) or "because the rain" without a verb (wrong). Remember: if the next word is a subject pronoun (I, he, she, it, they, we) or a noun followed by a verb, use because. If the next word is "the," "my," "a," or a noun without a verb, use because of. You can also use "because of" with a gerund: "Because of being late, he missed the introduction." This distinction between the conjunction and the preposition is one of the most frequently tested grammar points in B1-B2 English examinations.