2(Para. 2) It was while clearing out the old barn on the far side of the yard that he made an interesting discovery. It is/was the emphasized part+ that/who e g: It was last weekend that I visited the museun。 2. It is I who/that am to go to the conference in his place 3. It was because she was ill that she didnt attend the meeting• 2(Para.2) It was while clearing out the old barn on the far side of the yard that he made an interesting discovery. : It is/was + the emphasized part + that/who… • e g : ①. It was last weekend that I visited the museum . • ②. It is I who/that am to go to the conference in his place. • ③. It was because she was ill that she didn’t attend the meeting