1. "team have" → "team has" — US English, collective noun singular
2. "week's" → "weeks" — plural, not possessive
3. "beleive" → "believe" — spelling error
4. "its" → "it's" — contraction of "it is"
5. "implementation are" → "implementation is" — singular noun
6. "there is several" → "there are several" — plural verb needed
7. "cases that needs" → "cases that need" — plural antecedent
8. "users gives" → "users give" — plural subject
9. "it improve" → "it improves" — singular subject-verb agreement

The team has been working on the feature for three weeks, and we believe that it's almost ready for release. The implementation is mostly complete, although there are several edge cases that need more testing. When users give feedback, they often mention how it improves their workflow significantly.