parveenjain Wrote:Had the "that" being refereed to "tools", shouldn't it be in plural form i.e. "those"?
So in that case, use of "that" is anyways wrong.
Please correct if I am interpreting it wrong?
for this kind of "that", you're wrong -- the plural and singular forms are both "that".
e.g.
Here is a box that once contained sacred relics.
Here are two boxes that once contained sacred relics.
both correct
---
you are thinking of a different kind of "that" -- namely, the type of "that" that appears in comparisons.
for instance
the economy of country X is more stable than that of country Y
the senators from state X are more conservative than those from state Y
both correct.