They had hardly started playing tennis when it began to rain.
Giải thích
Hardly had they started playing tennis when at began to rain.
Dịch nghĩa: Họ vừa bắt đầu chơi tennis thì trời đổ mưa.
Hardly had they started playing tennis when at began to rain.
Dịch nghĩa: Họ vừa bắt đầu chơi tennis thì trời đổ mưa.