What wrong with these sentence

第一句的問題包括：
兩個連接詞，because和so「因果關係」在句中不太合用。當然，未收拾好行李並不能出發往機場，但是收拾好行李並不是出發的原因。這樣寫會自然一些：Now that I have finished packing my bags, I am ready to go to the airport.第二句有以下的問題：to be going + to go 很重覆，可直接寫成to be goingWe go on our family trip 也是重覆的寫法，「我們」的家庭旅行當然是跟自己的家人去。We go on a family trip才對。由於出行需要護照，所以寫before we get our passports在邏輯上行不通。你可以寫：We are going on a family trip to London once we have obtained our passports. 不過，句子在意思上仍是頗怪的。除了護照外，你還要有機票、住宿安排才可以起行。

1. I have packed my bags, so I can go to the airport/As I have packed my bags, I can go to the airport.

2. We are ready to go on a trip to London since we got the passports visaed/Our family are ready to go on a trip to London since we had the passports visaed.

because=so=因為所以,記住所有英文連接詞,不一定要兩個,比如although=but=雖然,但是,只能用1個,不然文法不對,而because是連接詞,不宜放句前
正: x I have finished packing my bags ,so now I can go to the airport.
邏輯問題:肯定先有護照再出境的,只能用after之後,不能用before之前
正:We are going to go on our family trip to London after we get our passports.

As I packed my luggages so I can go to the airport right now.
We are going on our family trip to London as soon as we got our passports.