Do as directed 
1)I was too late t catch the 8:40 train(use:so that)
2)That was the longest week end of my life(use:longest)
3)Her blisters was worst than mine(begin:my)

Dear student, 

1. I was so late, that I couldn't catch the 8:40 train. 
​​​​​​2. That weekend was longer than any other weekend of my life. / No other weekend was as long that weekend. 
3. My blisters are not as bad as hers.

Regards