Употребите глаголы данные в скобках в present past либо future perfect.

They had led this market niche since last year. Они занимали эту рыночную нишу с прошлого года.

They hadnt led this market niche since last year.

Had they led this market niche since last year?

Who had led this market niche since last year?

What had they led since last year?

When had they led this market niche?

Had they or had you led this market niche since last year?

Had they led this market niche or that market niche since last year?

Had they led this market niche since last year or since last month?

They had led this market niche since last year, had not they?