My neighbor was mowing the lawn for me.he was wearing a mask but sometimes he took his mask off.then he talked to another neighbor who was wearing a mask right in front of my house.can this give covid19 to me?i closed my window s&didn't talk to them?

If you were not close to him and practiced social distancing you should be ok. Furthermore, it is wise to get vaccinated to protect yourself and your loved ones.

Unless the person is very sick and coughing on the other person, it is extremely unlikely to contract COVID19 in most cases out of doors.

Had you received Covid vaccine, you would not need to worry about theoretical risk. Get Covid vaccine.