Помогите пожалуйста! Задание: Put the verbs in brackets into the "Past Simple" or the "Present Perfect"
2) it has existed 3) has developed 4) found 5) explored 6) saw 7) stopped 8) caught 9) I always wanted 10) but I didn't think 11) have studied 12) he said 13 ) has bought 14) They showed