Hello native English speakers. Of the following five pairs of sentences , which one in each pair is grammatically correct? 1a. He was one of those returned soldiers. 1b. He was one of those returning soldiers. 2a. The soldier had not been gone two minutes when there was an explosion. 2b. The soldier had not been and gone two minutes when there was an explosion. 3a. Returned to his country. Tom started kindergartens. 3b. Returning to his country. Tom started kindergartens. 4a. The train arrived at platform one is from York. 4b. The train recently arrived at platform one is from York. 5a. With the tree growing tall, we get more shade. 5b. With the tree grown tall, we get more shade.