4. "We're going ice-skating." They said they________________ice-skating.

`\text{#A}`

$=>$ Were going

$-$ Câu trên là câu trực tiếp $->$ Lùi thì

$+$ Hiện tại tiếp diễn $->$ Quá khứ tiếp diễn

( S + tobe + V_ing ) $->$ ( S + was / were + V_ing )

$-$ They là số nhiều $->$ Dùng were