III. Identify the bold-written adverbs in the sentences below. Write F for adverbs of frequency and I for adverbs of intensity.

11. Silver needs to be cleaned (occasionally) .

12. Copper is (usually) used in electronics because of its high conductivity.

13. (Sometimes) , aluminum is mistaken as silver due to their identical colors.

14. Ceramics is (so) much more brittle than metals

15. Steel is (normally) used as a structural foundation for houses and buildings due to its high​

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