求英文达人帮我分析这几个句子错哪了（3）

1.Roy (has visited) Yellowstone National Park last year.
last year.是过去时,括号里应该填visited.
2.In 1872,Congress (maked) the Yellowstone area a park.
1872年是过去时,括号里应该用make的过去时made.
3.(Have) you (saw) any grizzly bears when you (were) in the park last year?
同1,应该是填did/see(问句中动词还原)/were(when引导的从句中动词不还原)
4.Two years ago,we (have tried) to make a reservation.
我觉得也是过去时,填tried

1.Roy (has visited) Yellowstone National Park last year.
2.In 1872, Congress (made) the Yellowstone area a park.
3.(Did) you (see) any grizzly bears when you (were) in the park last year?
4.Two years ago, we ( tried) to make a reservation.