Write the verb in brackets in the correct form. The United Nations (to have) meetings where world leaders agree on what to do about global warming. If there is too much pollution in the air, some people (to have) health problems. Ecologists looked for special spots on white pine trees to know if there (to be) high levels of ozone. The teacher asked the boys if they (to do) the task.Satellite images proved that deforestation (to increase) rapidly.
Write the verb in brackets in the correct form. The United Nations (to have) meetings where world leaders agree on what to do about global warming. If there is too much pollution in the air, some people (to have) health problems. Ecologists looked for special spots on white pine trees to know if there (to be) high levels of ozone. The teacher asked the boys if they (to do) the task.Satellite images proved that deforestation (to increase) rapidly.
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The United Nations has meetings where world leaders agree on what to do about global warming. If there is too much pollution in the air, some people have health problems. Ecologists looked for special spots on white pine trees to know if there are high levels of ozone. The teacher asked the boys if they had done the task. Satellite images proved that deforestation is increasing rapidly.