I would say that sometimes you would not 'identify' a mistake in your head. Also if you read it out loud you might realize how it does not make sense in your sentence.
Hope this helped!
;D
In “Sir Gawain and the Green Knight” on the third day that Sir Gawain is at the Lord Bertilak’s castle, Lady Bertilak gives him a silk girdle. Lady Bertilak urges him to keep it with him as it has the ability to protect an honest person from death. Being terrified of his meeting with the Green Knight, Sue Gawain gladly takes it. However, Sir Gawain had promised to give Lord Bertilak anything he was given back to him before he left. This means that Sir Gawain, in not giving the girdle back, is no longer an honest man. In addition to this the girdle is green, this is foreshadowing the fact that the girdle belongs to the Green Knight. The Green Knight, who had not died when Sir Gawain decapitated him in their first encounter, likely did so because he was wearing the girdle. This shows that the Green Knight is an honest man, contrasting him with Sir Gawain who fails to be honest in taking the girdle.
Its got one eye..............................
1. His collection of paintings ARE valuable and rare.
2. The flight of the stair to the temple IS under repair.
3. The internet PROVIDES a wealth of information for the users.
4. A fleet of antique cars PASS by the road every Sunday morning.
5. This string of pearls COSTS a lot of money.
A) would be your answer hope this helps :)