Looking on the internet deeply has found these results:

we watched a movie last weekend is the most popular phrase on the web.

we have watched a movie last weekend 10 results on the web	we watched a movie last weekend 13 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Nov 29, 2012 ... Jyl has been talking about you non stop for the past couple of weeks…well alright, she did stop while we watched a movie last weekend, but ... Mar 14, 2013 ... We watched a movie last weekend. Similarly, being in a job I like, I have no idea what the future holds as far as my degree in Criminal Justice. May 10, 2011 ... If you are providing information about a specific noun, 'the” is required. Here are a few article examples: We watched a movie last weekend.

we have watched a movie last weekend

10 results on the web

we watched a movie last weekend

13 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Nov 29, 2012 ... Jyl has been talking about you non
stop for the past couple of weeks…well alright, she did stop while we watched a movie last weekend, but ...
Mar 14, 2013 ... We watched a movie last weekend. Similarly, being in a job I like, I have no idea what the future holds as far as my degree in Criminal Justice.
May 10, 2011 ... If you are providing information about a specific noun, 'the” is required. Here are a few article examples: We watched a movie last weekend.