1. I am glad because my dog gives birth to four puppies.

2. I am glad because my dog gave birth to four puppies.

3. I was glad because my bog gave birth to four babies.

4. I was glad because my dog had given birth to four babies.

(Which expressions are correct and commonly used? Thank you for your help.)

the 2nd one does, but u wouldn't have to use because

#1 is not correct English.

The other three are correct and commonly used.

Typically newborn dogs are not called babies, so #2 is the best version. Babies are usually assumed to be human.

I hope this helps a little more. Thanks for asking.

YEAH # 2 IS THE BEST ONE OUT OF 3

All four expressions are grammatically correct, but some may be more commonly used than others depending on the context and personal preference.

1. "I am glad because my dog gives birth to four puppies" - This sentence implies that the dog is currently giving birth to the puppies, which means it is happening in the present. This form is less common compared to the other options, but it can be used if the birth is ongoing or if you want to emphasize the continuous nature of the action.

2. "I am glad because my dog gave birth to four puppies" - This sentence indicates that the dog already gave birth to the puppies, and the birth is now completed. It is a commonly used expression to describe past events.

3. "I was glad because my dog gave birth to four babies" - This sentence is similar to the second one but uses the word "babies" instead of "puppies." The choice between "puppies" and "babies" depends on personal preference and the context of the situation. However, "puppies" is more commonly used when referring to the young of dogs.

4. "I was glad because my dog had given birth to four babies" - This sentence uses the past perfect tense ("had given birth") to indicate that the birth of the puppies had already taken place before the specific time mentioned. The addition of "had" suggests a prior event or action. This form is less commonly used in everyday conversation but can be utilized when speaking about a past event that occurred before another past event.

In summary, expressions #2 and #3 ("I am glad because my dog gave birth to four puppies" & "I was glad because my dog gave birth to four babies") are the most commonly used and suitable for most situations.