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Sentence analysis
10Spans
Sentence
Span Details
原生代
Proterozoic eranoun
は、
topic markergrammar
酸素濃度
oxygen concentration; oxygen contentnoun
が
subject markergrammar
上昇
rise; increase; climb; ascendnoun, suru verb, no-adjective
し
light/support verb with a noun or noun-like phrase-> するgrammar
始め
start; begin; commence; start up; open; establish; start to ...; begin to ...-> 始めるichidan verb, auxiliary
た
past tense or completed actiongrammar
時代
period; epoch; era; age; the times; those days; oldness; antiquity; antique; period piecenoun
です。
be; is; arecopula, auxiliary
出洲ですspit of land; sandspit