Future and present perfect passive 1 Complete the sentences from the text on page 49 with the words in the list. ac complete the rule with past participle (x2), be and present perfect. been recorded | been explored | be found be understood 1 Most of these have not 2 So far, around 2.5 million insect species and 400,000 plant species have 3 But of course, as further studies are carried out, more will ocean conditions. .. some people think that tens of thousands more will about life in in the future. 4 RULE: To make the future passive, we use will + 1 the 2 • To make the present perfect passive, we use the form of to be and the 3 4.

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