Do you use has or have before began?

How does kennedy describe the children who might benefit from medical space technology

Leslie would probably have come with us if she didn’t work all summer. which is the verb phrase?

When i was four years old, my dad and i a tree in our front yard. it was a tiny, fragile sapling. he promised me that it would grow tall and strong, but he said that i had to be patient. until i turned 18 years old, dad and i it every year on my birthday. choose the words that correctly fill in the blanks.