The learning objective that you share with your class is not a description of the tasks they will complete during the lesson. Instead it is a reflection of what they will have achieved by the end of the lesson. In 2002 the DfES identified some learning objective starters (in their Training material for foundation subjects resource) to help write effective learning objectives:
To know that..
For when you're sharing factual information with your class.
To be able to..
Sometimes abbreviated to TBAT, this type of learning objective would be used where skills are being developed.
To understand how/why...
This type of learning objective is when we're learning concepts, reasons, effects, processes and principles.
To develop/be aware of...
If you're focusing on expressing value and attitudes such as moral issues, empathy, feelings etc, then this is a useful way to start off your learning objective.
Be aware that a lot of times teachers will start their learning objective off with to.
This isn't necessarily a bad thing although it could be perceived as being a little lazy. If you're going to do it properly, I suggest thinking about what you want your pupils to achieve by the end of the lesson and write your learning objective accordingly.