1. We stearted working on this programme 5 years ago
$\longrightarrow$ This programme was started working 5 years ago
2. Our instructors began teaching extra classes for students with learning disabilities since 2008
$\longrightarrow$ Extra classes for students with learning disabilities were begun teaching by our instructors since 2008
3.We stearted learning French two weeks ago
$\longrightarrow$ French is started learning two weeks ago
4.Why don't we go out for lunch
$\longrightarrow$ They suggest going out for lunch
$\longrightarrow$ How about going out for lunch?