1. The last time I was aboard was in the summer of 1978

→  I haven't been abroad since the summer of 1978.

2. It's ten years since that house was lived in

→ That house was lived ten years ago

3. I haven't seen him for 2 months 

→ I last saw him 2 months ago

4. I haven't been to a concert for over a year 

→ The last time I have been to a concert for over a year

5. The last time I really enjoyed myself was your birthday party 

→ I haven't enjoyed myself was your birthday party

1 =>  I haven't been abroad since the summer of 1978 : Tôi đã không ra nước ngoài kể từ mùa hè năm 1978.
2 => That house was lived ten years ago : Ngôi nhà đó đã được sống cách đây 10 năm.

3 => I last saw him 2 months ago : Tôi gặp anh ấy lần cuối cách đây 2 tháng.
4 => The last time I have been to a concert for over a year : Lần cuối cùng tôi đã đến một buổi hòa nhạc trong hơn một năm.
5 => I haven't enjoyed myself was your birthday party : Tôi không thích bản thân mình là bữa tiệc sinh nhật của bạn

@vananh