the persons speaking or writing
[We are friends.]
[We are writing on our tablets.]

at which time
[I know when I can swim]

what one or what ones
[Which road is best?]

a period of time
[I watched television for a long while.]

for what reason, cause, or purpose
[Why did that happen?]

in the inner part of; inside
[There are three baby birds within the nest]

the person or persons that are being spoken to
[I am talking to you.]

The models marked with * were created by Brandon, age 11.