....and his accent isn't that strong.
g. when contradicting what someone else has said, the word " is n't" would be stressed, as you have shown. In other cases it may be stressed or unstressed according to individual speaker variation.
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In certain situations, e.g. when contradicting what someone else has said, the word "isn't" would be stressed, as you have shown. In other cases it may be stressed or unstressed according to individual speaker variation. The other stresses that you have shown are normal.