1. Despite the bad weather, we went out for a picnic.
=>  We went out for a picnic although the weather was bad
2. “ You should visit the company’s website.” He told me
=> He told me that I should visit the company’s website.
3. I started work for the company a year ago.
=> I've worked for the company for a year.
4. I haven’t met this girl before.
=> This is the first time that I have met this girl.
5. Thousands of people have to build that castle for him for years. 
=> That castle has to be built for him by thousands of people for years.
Giải thích:
* Công thức mệnh đề  nhượng bộ:
+ Although + S + V, S + V
+ Despite +V-ing/ N, S + V.
In spite of + V-ing/ N, S + V.
* Công thức: Lần thứ...( làm chuyện gì đó)
S+ have/ had + never +V3/ed
S+ have/had+ not+ V3/ed + before
=> It/This is/ was the first time (that) + S + have/had + V3/ed
Ex: I haven't eaten American food before.
=> This is the first time I have eaten American food.
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STUDY WELL~