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Sentence analysis
8Spans
Sentence
Span Details
トンネル
tunnel; tunnel through a potential barrier; letting a grounder go through one's legsnoun, suru verb
を
object markergrammar
掘進
tunnelling; excavation; drilling; boringnoun, suru verb
する
light/support verb with a noun or noun-like phrasegrammar
工事
construction work; constructionnoun, suru verb
が
subject markergrammar
始まっ
begin; start; commence; start up again; begin again; happen again; date from; originate in; have its beginnings in-> 始まるgodan verb
た。
past tense or completed actiongrammar