Completar frases Future perfect vs future contiVersión en línea Complete these sentences. Use a future perfect form of the verbs given. por Yessica Lizeth Barragán Malpica 1 1 . By the time spring arrives , the groundhog ( hibernate ) for six months . 2 . it's winter in Canada and too cold for the monarch butterfly to feed and survive . So it starts its journey south , and by the time it arrives in Mexico , it ( fly ) more than 4 , 000 kilometers ( 2 , 485 ) . 3 . Giant pandas almost exclusively eat bamboo . At the end of the day , when it finishes feeding , it ( eat ) 40 pounds of bamboo and it ( forage ) for 16 hours . 4 . These gray whales are leaving their feeding grounds in the cooler north to breed in the warmer south . When they reach Mexican waters , they ( swim ) 160 kilometers ( about 100 miles ) a day for 8 to 10 weeks . 5 . After mating at sea , female leatherback turtles come ashore . It's here that they dig a hole , and by the end of the night , they ( lay ) 80 or more eggs . 6 . Some bald eagle nests weigh more than a ton . But by the time they reach this weight , the bald eagles ( add ) sticks to the nest for several years . 7 . This female elephant is heavily pregnant . By the time she is ready to give birth , she ( carry ) the baby for over 22 months .
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