Imps.
1C is 15+ (often bal)
1D is H or pts (often 6-8)
1S is bal without 3H (15-16 or 19-20) or 5S unb 15-17 or 5C+4S 15-20.
your options are
2C= H+D Gf, you will likely be forced to show your 0544 shape ending in 3S unless partner got 6 great spades or good hand with clubs.
1NT= not forcing, tend to show clubs or many invitationnal hands.
partner will only pass 1NT with 15-16 pts and without 3H. either bal with 2H 3244,4243,4234,5233,3253 or unbalanced with 5143,5242,5134,5224.
1C is 15+ (often bal)
1D is H or pts (often 6-8)
1S is bal without 3H (15-16 or 19-20) or 5S unb 15-17 or 5C+4S 15-20.
your options are
2C= H+D Gf, you will likely be forced to show your 0544 shape ending in 3S unless partner got 6 great spades or good hand with clubs.
1NT= not forcing, tend to show clubs or many invitationnal hands.
partner will only pass 1NT with 15-16 pts and without 3H. either bal with 2H 3244,4243,4234,5233,3253 or unbalanced with 5143,5242,5134,5224.