What is the difference between first and second conditional?

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1. What can cause lower back pain when sitting? What can cause lower back pain when sitting? Causes of lower back pain when sitting down Sciatica. Sciatica refers to pain in the sciatic nerve, which runs down the base of the spine into the back of your legs. Herniated disc. Muscle strain. Degenerative disc disease. Spinal stenosis. Posture. Not...
2. Should your feet touch the floor on a sofa? Should your feet touch the floor on a sofa? Generally speaking, when you're sitting on a sofa, your knees should be bent at a 90-degree angle and your feet should touch the floor. Additionally, you should be able to sit comfortably without having to use a throw pillow and your...
3. Why do sofas have low backs? Why do sofas have low backs? If you have a smaller room, a lower back keeps the space looking open. Lower back furniture is also good to buy if it's going in front of a window and you don't want to block the view....
4. Are pillow back sofas good? Are pillow back sofas good? Pillow-back sofas are generally considered more comfortable and inviting, but there's a downside: unless you're diligent with your fluffing, the cushions will usually look slightly askew. If you're the kind of person who is driven to distraction by something like that, you might want to...
5. Are high back sofas better? Are high back sofas better? High back sofas offer support to the head and neckIf you have problems with your back, then a high back sofa could help enormously in enabling you to fully relax. The added support that the design offers to your head and neck could help to...
6. Should sofa have a high back? Should sofa have a high back? Sofa HeightHigh backs are most appropriate for large rooms and rooms with high ceilings as they will help to create a sense of proportion. On the other hand, a low back will prevent your sofa from overly dominating a smaller room....