V.

$\text{1.}$ They will be learning English at this time tomorrow.

$\text{→}$ tomorrow chia TL

$\text{→}$ at + time

$\text{→}$ at this time tomorrow là tg xác định ở TL chia TLTD

$\text{2.}$ We will reduce the use of out electricity to save energy.

$\text{→}$ Chúng tôi sẽ giảm việc sử dụng điện để tiết kiệm năng lượng.

$\text{3.}$ He destests listening to folk music because he finds it boring.

$\text{→}$ detest + V-ing

$\text{→}$ listen to music

$\text{→}$ find sth/ doing sth + adj

$\text{4.}$ Do leisure activities make us feel relaxed?

$\text{→}$ adj-ing dùng để chỉ vật

$\text{→}$ adj-ed dùng để chỉ người

$\text{5.}$ Would you mind if I used your mobile phone?

$\text{→}$ Câu đk loại 2: $\text{If + S + Ved/ P1/ were, S + would/ could/ might + V.}$