でいる meaning

[1559744853_514433]

２６日の集会について主催者は、過去最大規模の１５０万人の参加を見込んでいる。

What is the meaning of でいる here and why 見込む is changed to 見込ん?

Thanks.

[jim.schuler]

見込む has not been changed to 見込ん. It's instead been conjugated into its て-form; 見込んで. Adding the verb いる to the end of a て-form verb indicates a state, much like adding -ing to the end of a verb indicates a continuous action. So they are anticipating (or, more accurately, in a state of anticipation for) a record number of 1.5 million people.

[community.japanese]

san, jim.schuler san
Konnichiwa.
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Yuki 由紀
Team JapanesePod101.com