krndatta wrote:
KarishmaB Ma'am,
Doesn't the "that clause" modify "the method"?
The method was as early as 18thcentury?
Yes, 'that' does stand for 'the method.' Here is the clause you get:
The method was as early as 18th century.
Does this make sense? The method was what?
The method was used as early as 18th century.
The method was popular in the18th century.
etc.
When your main verb is a 'to be' verb (was), you need an equivalence creating noun or an adjective.
e.g.
He is a
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