present perfect vs past simple

Which sentence is in the present perfect.

• I went to town yesterday.

• I have been to town this morning.

Which sentence is in the present perfect.

• She ate all the cake.

• She has eaten all the cake.

Which sentence is in the present perfect.

• We have just done our homework.

• I did my homework last night.

Which sentence is in the present perfect.

• The children cleaned their teeth.

• The children have cleaned their teeth.

Which sentence is in the present perfect.

• They have had a baby.

• They had a baby last year.

Which sentence is in the present perfect.

• She went to university in Oxford.

• She has gone to university in Oxford.

Which sentence is in the present perfect.

• I have come to college by bus everyday this week.

• I came to college by bus this morning.

Which sentence is in the present perfect.

• I was at home all morning.

• I have been at home all morning.

Which sentence is in the present perfect.

• I ate three bananas yesterday morning.

• I have eaten three bananas this morning.

Which sentence is in the present perfect.

• Who ate all the chicken?

• Who has eaten all the chicken?