YOU SAID:

i had three dogs and we will have been going to the park for seven weeks yesterday

INTO JAPANESE

私は3匹の犬を飼っていたので、昨日は7週間公園に行きました

BACK INTO ENGLISH

I had 3 dogs so I went to the park yesterday for 7 weeks

INTO JAPANESE

私は3匹の犬を飼っていたので、昨日7週間公園に行った

BACK INTO ENGLISH

I went to the park yesterday for seven weeks because I had three dogs

INTO JAPANESE

私は犬を３匹飼っていたので、昨日７週間公園に行った

BACK INTO ENGLISH

I went to the park yesterday for seven weeks because I had three dogs