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Sentence analysis
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Sentence
Span Details
内燃機関
internal combustion enginenoun
の
possession, attribution, nominalizer, or nominal linkergrammar
効率
efficiencynoun
を
object markergrammar
改善
improvement; betterment; kaizen (continuous improvement)noun, suru verb
する
light/support verb with a noun or noun-like phrasegrammar
研究
research; study; investigationnoun, suru verb
が
subject markergrammar
進ん
advance; go forward; move ahead; precede; go ahead; lead; make progress; improve; deepen; heighten; intensify; be fast (clock); be ahead; gain time; do willingly; do of one's own accord-> 進むgodan verb
でいる。
ongoing or resultant state-> ているgrammar