What is the difference between the contractions in Column I and those in Column II?

Column I       Column II

I'd                       I'm

I'll                       He's

He'd                    She'd

We'll                   She'll

We've                  You've

 

Answer:

 

The contractions in Column I, when pronounced, have homophones. Those in Column II do not:

 

I'd - Eyed

I'll - Isle or aisle

He'd - Heed

We'll - Wheel

We've - Weave