I'm going to explain how
to modify comparative adjectives.
To describe a small difference,
you can use the words 'a bit',
'a little' or 'slightly', for example:
'Tom is a bit taller than me.'
'Tom is a little taller than me'.
And 'Tom is slightly taller than me.'
To compare big differences, you can use
'a lot', 'significantly', 'far' and 'much', for example:
'Physics is much more difficult than history.'
'Physics is a lot more difficult than history.'
'Physics is far more difficult than history.'
Or: 'Physics is significantly more difficult than history.'
The final thing to mention is which words
can't be used with comparative adjectives.
'Very' and 'really' can never be used in
a comparative sentence.
Compare comparative adjectives with
'a bit', 'a little', 'slightly' for small differences,
or 'a lot', 'significantly', 'far' and 'much'
for big differences.