then / than

1a. 3The hotel we were staying at was more accommodating then the last two hotels we satayed at.
1b. The hotel we were staying at was more accommodating than the last two hotels we satayed at.
2a. Although arbitrary arrests are illegal, they continue to occur in many parts of the country.
2b. Although arbitrary arrests are illegal, they continue to arrest in many parts of the country.
Please correct the above.
Thanks.