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How to define the fixed and random effects in lmer

FMH
Dear All,

I was running lme function on my data as shown below, in which the variables involved are:

########################################
#Pre : Precipitation
#t : time
#group : Group of precipitation
#prec: data set

lme(Pre ~ t| group, data = prec, random = ~ t| group)
#########################################

How could i write the scripts?with lmer function with :
1. fixed effects for the intercept and slope and only random effect for the intercept is included
2. fixed effects for the intercept and slope, and?random effects for the intercept and slope are included
3. only fixed effect for the intercept and only random effect for the intercept is included
4. only fixed effects for the slope, and?random effects for the intercept and slope are included?

Thank you
Fir