1. Could be either exclamatory or declarative.
2. is interrogative.
3. is not imperative.
https://i.pinimg.com/736x/63/bc/af/63bcaff6fd4edb51a56ddf1ec5fdeaf7--kinds-of-sentences-sentence-types.jpg
Is this an imperative, declaritive, interrogative or exclamatory
1.God exist
answer: exclamatory
2.What are you up to?
answer: interrogative
3. Some dentist have clean teeth
answer: imperative
3 answers
Some dentist have clean teeth
answer: declarative
answer: declarative
Yes, 3 is declarative.