明日(あした) ashita雨(あめ) ameが ga降(ふ)れ()ば() fureba、遠(えん)足(そく) ensokuは waありません arimasen。 If it rains tomorrow, there won't be a field trip. Literal Tomorrow rain [subject-が] fall-if, excursion [topic-は] exist-not. 遠足 ('excursion, field trip') is a school vocabulary word. ありません is the polite negative of ある. The は on 遠足 is contrastive — 'as for the field trip (specifically), it won't happen.' schoolweatherstudyingeducationcontrastive は~ば (conditional)
明日(あした) ashita雨(あめ) ameが ga降(ふ)れ()ば() fureba、遠(えん)足(そく) ensokuは waありません arimasen。 If it rains tomorrow, there won't be a field trip. Literal Tomorrow rain [subject-が] fall-if, excursion [topic-は] exist-not. 遠足 ('excursion, field trip') is a school vocabulary word. ありません is the polite negative of ある. The は on 遠足 is contrastive — 'as for the field trip (specifically), it won't happen.' schoolweatherstudyingeducationcontrastive は~ば (conditional)