明日雨降りなら、家にいます。
tbd
I'll stay at home if it rains tomorrow.
If it's raining tomorrow, I'll stay home.
I'll stay home if it rains tomorrow.
I will stay home if it rains tomorrow.
If it rains tomorrow, I'll stay home.
家， いえ
1. house, residence, dwelling
2. family, household
3. lineage, family name
房子，住宅；家；家族
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd