This grammar exercise tests your ability to use tenses correctly. It is designed for students of classes 8, 9 and 10.<\/p>\n
Parents and teachers can print our worksheets for use in class or at home. You can find more tenses exercises and worksheets here.<\/p>\n
Astronomers recently \u2026\u2026\u2026\u20261\u2026\u2026\u2026 (watched \/ watching \/ watch \/ have watched)\u00a0 a comet break into pieces, practically before their eyes. Their observations, \u2026\u2026\u20262\u2026\u2026. (reporting \/ have reported \/ reported \/ report) by scientists at Johns Hopkins University, \u2026\u2026\u2026\u20263\u2026\u2026.. (give \/ have given \/ had given) them surprising insight into the structure of these space objects.<\/p>\n
Comets are fairly small (about 12 miles across or less) balls of ice, rock, and dust. They \u2026\u2026\u2026\u20264\u2026\u2026. (make \/ making \/ have made \/ had made) long, non-circular orbits around the sun. When a comet \u2026\u2026\u20265\u2026\u2026.. (came \/ come \/ comes \/ had come) close to the sun, the star’s heat \u2026\u2026\u20266\u2026\u2026.. (melt \/ melting \/ melts \/ melted) some of it, creating what looks like a tail. At this stage, it \u2026\u20267\u2026\u2026\u2026. (is looking \/ looks \/ looked) somewhat like a tadpole. Comets sometimes \u2026\u2026\u2026\u20268\u2026\u2026. (bursting \/ burst \/ bursted) into pieces when the sun’s heat \u2026\u2026\u20269\u2026\u2026. (turned \/ turn \/ turns \/ turning) their ice into water vapor.<\/p>\n
Until a little ago, scientists \u2026\u2026\u202610\u2026\u2026\u2026 (think \/ thought \/ were thinking) that a comet’s center \u2026\u2026\u202611\u2026\u2026\u2026. (is \/ will \/ would) be different from its surface. That’s because comets probably \u2026\u2026\u202612\u2026\u2026 (formed \/ were forming \/ form \/ forms) at the same time as the solar system, so the material at the center has probably remained unchanged for just as long.<\/p>\n
Astronomers recently watched (1)<\/strong> a comet break into pieces, practically before their eyes. Their observations, reported (2)<\/strong> by scientists at Johns Hopkins University, have given (3)<\/strong> them surprising insight into the structure of these space objects.<\/p>\n Comets are fairly small (about 12 miles across or less) balls of ice, rock, and dust. They make (4)<\/strong> long, non-circular orbits around the sun. When a comet comes (5)<\/strong> close to the sun, the star’s heat melts (6)<\/strong> some of it, creating what looks like a tail. At this stage, it looks (7)<\/strong> somewhat like a tadpole. Comets sometimes burst (8)<\/strong> into pieces when the sun’s heat turns (9)<\/strong> their ice into water vapor.<\/p>\n Until a little ago, scientists thought (10)<\/strong> that a comet’s center would (11)<\/strong> be different from its surface. That’s because comets probably formed (12)<\/strong> at the same time as the solar system, so the material at the center has probably remained unchanged for just as long.<\/p>\n","protected":false},"excerpt":{"rendered":" This grammar exercise tests your ability to use tenses correctly. It is designed for students of classes 8, 9 and 10. Parents and teachers can print our worksheets for use in class or at...<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[231],"tags":[113],"class_list":["post-2605","post","type-post","status-publish","format-standard","hentry","category-class-10-worksheets","tag-class-10-grammar-worksheets"],"_links":{"self":[{"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/posts\/2605","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/comments?post=2605"}],"version-history":[{"count":1,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/posts\/2605\/revisions"}],"predecessor-version":[{"id":2606,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/posts\/2605\/revisions\/2606"}],"wp:attachment":[{"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/media?parent=2605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/categories?post=2605"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/tags?post=2605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}