A little tiredness after taking these drugs is to be expected.

服用这些药后有点倦意是正常的。

It is to be expected that an experiment will sometimes run into a snag at first.

开始试验时有时不很顺手，也是很自然的。

This is to be expected, though.

不过这也是在意料之中。

The questions are to be expected.

问题都在意料之内。

This is normal. This is to be expected.

这很正常，也是意料之中的事。