1.楼主是正确的,
2.consider to do/doing都有,但是意思不同.
consider 作“考虑”,“细想”,“考虑到”解,常用于句型:(1)consider doing something ; (2)consider how / when / what…to do(sth .) ; (3) consider something ; (4) consider how / when / what 等引导的从句.
consider 作“认为”,“把……看作”解,常用于句型:(1) consider somebody / something(to be)something / adj .; (2) consider sb .to do sth .; (3) consider it + n ./ adj .+ to do sth .; (4) consider + that引导的从句.