Rearrange the parts to make a meaningful sentence.

P. had already left

Q. could to catch

R. as fast as he

S. the bus, but it

T. the boy ran

Explanation

1. 01

   T has the subject and the verb, and R begins "as fast as he", which Q completes with "could", then "to catch", which needs an object.

2. 02

   S gives it, "the bus,", and "but it" brings the contrast. "It" needs a verb: P.

3. 03

   So the order is TRQSP: "The boy ran as fast as he could to catch the bus, but it had already left."