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Sentence analysis
9Spans
Sentence
Span Details
長年
many years; a long timenoun, adverb
に
direction, time, indirect object, or target markergrammar
わたっ
cross over; go across; extend; span; cover; range-> 渡るgodan verb
て
connective te-formgrammar
研究
research; study; investigationnoun, suru verb
が
subject markergrammar
続け
continue; keep doing; keep up; continue to ...; keep on ...-> 続けるichidan verb, auxiliary
られ
passive, potential, or respect auxiliary-> れる/られるgrammar
ている。
ongoing or resultant stategrammar