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There is a boy reading under the tree. 中的reading under the tree 為修飾 boy 的定語，相當(dāng)于 who is reading under the tree.　　

This is Tom speaking. 中的 speaking 也是后置定語，相當(dāng)于 who is speaking.　　

There is much to do 中的不定式也是定語。there is … 后接不定式與現(xiàn)在分詞的區(qū)別是：用不定式表示“要做……”，接現(xiàn)在分詞表示“正在做……”。